| Advanced Materials Center, Inc. - Environmental services, and materials and products evaluation and testing. Based in Illinois. |
| Advanced Waste Management Systems, Inc. - Hazardous waste management, overseas environmental project management, and environmental site evaluations. Based in Tennessee. |
| American Management Resources Corp. - Offering environmental professional design services, and environmental audits. Located in Florida. |
| Ami Adini & Associates, Inc. - Los Angeles, California-based specialists in environmental consulting, site impact assessments, hazardous waste, and storage tank issues. |
| Atlantic Environmental Inc. - Environmental, industrial hygiene and safety consulting and testing, chemical exposure, and indoor air quality experts. Located in New Jersey. |
| Block Environmental Services - Environmental and laboratory services. Based in California. |
| The Brattle Group - Providing consulting services concentrated in the areas environmental matters, finance, litigation, and utilities. Offices in Cambridge, Massachusetts, Washington D.C., and London, England. |
| Breedlove, Dennis & Associates - Diversified environmental consulting firm, with offices in Florida and Tennessee. |
| Cambridge Environmental, Inc. - Assessing and helping to minimize risks to health and the environment. Based in Massachusetts. |
| Campbell and Associates - Providing consulting services to industry and the legal community in geology, hydrogeology, water supplies, contaminant transport, and associated environmental disciplines. Based in Houston, Texas. |
| Chambers & Associates - Consulting Firm specializing in the conservation of marine fish and their essential habitats. Based in Kensington, Maryland. |
| Clement Mesavage, Jr. - Consultant for environmental, safety, and health litigation, based in Virginia. |
| Custom Environmental Services - Small, California-based consulting firm, assisting with environmental compliance, and providing expert testimony for Phase I Site Assessments. |
| Daniel B. Stephens & Associates, Inc. - Specialties include vadose zone and groundwater hydrology and remediation, water rights, water resources, civil and geotechnical engineering. Based in New Mexico |
| David F. Goldsmith - Consulting services and expert testimony for both federal and state cases for matters of epidemiology, environmental and occupational health. District of Columbia. |
| Eagle Industrial Hygiene Associates - Industrial hygiene services custom-tailored to client needs. Based in Pennsylvania. |
| Earthward Consulting - Consultations, computer simulations, and expert testimony regarding groundwater analysis, deep well injection, and SWIFT. |
| EBA Waste Technologies - California waste management consulting and engineering firm. |
| ENSR - Specializing in solving and preventing a broad range of environmental problems for industry. Located in Massachusetts. |
| Environmental & Turf Services, Inc. - Expertise in lead and arsenic contamination of shooting ranges. Based in Maryland. |
| Environmental Liability Management, Inc. - Risk management specializing in industrial and commercial properties. Based in New Jersey. |
| Environmental Litigation Associates - Seven senior environmental scientists and engineers serving the legal community on a broad range of environmental and scientific matters. |
| Environmental Systems & Technologies, Inc. - Environmental and computer technology experts, based in Virginia. |
| Epihealth Associates - Environmental health, public health and infectious disease epidemiological investigation and litigation support services. Based in Maryland. |
| ETS Inc. - Air quality consulting firm, specializing in air emissions control, measurement, training, design, troubleshooting, and regulatory services. Roanoke, Virginia. |
| First Environment, Inc. - New Jersey firm, providing services for environmental management, site investigation, and regulation. |
| The Forrester Group Inc. - Environmental management services, including business management, regulatory compliance, voluntary cleanup programs and contaminated property acquisitions. Based in Missouri. |
| Gershman, Brickner & Bratton, Inc. - Virginia firm, providing litigation support, dispute resolution, and other consulting services to the waste management industry. |
| Heritage Technical Services, Inc. - Providing environmental and engineering litigation support and consulting to clients throughout the Mid-Atlantic and Midwest regions. Based in Eastern Pennsylvania. |
| Hitchings Associates, P.C. - Industrial hygiene consulting firm specializing in laboratory planning, safety and design, industrial ventilation, and indoor air quality. Located in Indiana. |
| HSA Environmental - Offering environmental and geotechnical engineering, construction materials testing, industrial hygiene, and information management services. Offices in Florida and South Carolina. |
| HydroGeoLogic, Inc. - Services include soil and groundwater contaminant assessment and remediation, environmental compliance audits, risk assessment, and water supply investigations. Based in Virginia. |
| Integrated Environmental Management, Inc. - Consulting and services in the areas of radiation, radioactivity, nuclear science, safety and the environment. |
| Intertox, Inc. - Environmental and public health consulting firm, focusing on human health and ecological risk assessment. Seattle, Washington. |
| Lake Engineering, Inc. - Full service environmental engineering consultants, based in Georgia. |
| Leslie R. Dole, Ph.D., CM - Environmental remediation consultant, with experience in the areas of treatment and disposal of radioactive, chemical hazardous wastes. Specializing in solidification and stabilization technologies. |
| Mearns Consulting Corp. - Providing solutions for environmental problems ranging from investigations and assessments to remediation. Located in California. |
| Mercury Technology Services - Texas firm, specializing in environmental issues involving mercury. |
| MET Associates - Providing expert testimony and litigation support for forensic meteorology, air pollution modeling, air dispersion analysis, and toxic tort cases. Based in Texas. |
| The Noise Consultancy, LLC - Noise enforcement and code compliance experts, offering a full range of noise-related services. |
| Nutter, Overcash & Associates, Inc. - Services for waste water and sludge land treatment systems, wetland delineation and permitting, environmental, hydrogeologic, storm water, sediment, and soil investigations. Based in Georgia. |
| Pilko & Associates, Inc. - Providing management-oriented solutions to complex environmental, health and safety challenges. Offices in California and New Jersey. |
| Quantitative Decisions - Providing advice and strategy based on analyses and interpretations of data, with an emphasis on environmental ctatistics and decision analysis. Merion Station, Pennsylvania. |
| Resources & Systems International, Inc. - Specializing in watershed management, multi-aquifer groundwater systems, surface water resources, and litigation support. Based in Blacksburg, Virginia. |
| RGA Environmental, Inc. - Providing hazardous materials management, occupational health and safety, and environmental site assessment consulting, and engineering services. Based in California. |
| Richard L. Meehan - Specializing in geotechnical, hydrological and environmental engineering, failure analysis and investigations. Located in California. |
| Risk Management Incorporated - Specializing in the assessment and management of risk from exposures to chemical and radiological hazards. Based in Massachusetts. |
| Ron Joseph & Associates, Inc. - Offering consulting services and expert testimony for matters involving paints, coatings and solvents, including environmental issues, regulatory compliance, equipment and facilities design, and injury cases. Located in California. |
| Scientific Control Laboratories, Inc. - Expert consultation and lab services on environmental and industrial issues. |
| Shield Environmental Associates, Inc. - Offering environmental services, including preliminary investigations, reports, studies, recommendations, preparation of design drawings and construction management. Based in Kentucky. |
| Silicon Valley Coating Consultants - Coating and corrosion consultants, experts in litigation witness, failure analysis, finishing defects, environmental regulations, and materials failures. |
| Stone Lions Environmental Corporation - California firm, evaluating refining, petrochemical, and chemical operations, and associated toxic exposure problems. |
| Sullivan Environmental Consulting Inc. - Expert testimony for meteorological and air quality related litigation. Alexandria, Virginia. |
| Technical Sciences Group, Inc. - Consulting for the chemical, agrochemical, biotech, food products and animal health industries. |
| TRC Companies, Inc. - Environmental engineering and consulting, from offices throughout the United States. |
| Tri-S Environmental, Inc. - Sensible strategies and solutions for the environment. |
| Waid & Associates - Air quality services, particularly emissions control, permitting, and compliance. Based in Texas. |
| Water Resources Consulting Services - Civil engineering consulting firm in the field of surface water resources hydrology and hydraulics, with offices in northern California and Nevada. |
| Whitman Companies, Inc. - Environmental engineering and management services. Based in New Jersey. |